To ensure a constantly high product quality many successful producing companies rely on Statistical Process Control (SPC). For this, standardized data acquisition and evaluation methods e.g. Quality Control Charts (QCC) and Error Log Sheets (ELS) are used.
Besides the direct impact on quality, such systematic validation of product characteristics, tolerances, etc. provides vital input to the continuous improvement process. The most important requirement for quality assurance is to centrally plan, perform, document and evaluate the tests according to unvarying criteria.